COMPMID-586: Port LaplacianPyramid to new validation

Change-Id: Ic746d5f297eb354e63cefa8c682b03fc339be81d
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/128409
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: John Richardson <john.richardson@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>

6 files changed, 584 insertions, 0 deletions

diff --git a/tests/Utils.h b/tests/Utils.h
index 7d960dd08f..d0eebb1204 100644
--- a/tests/Utils.h
+++ b/tests/Utils.h
@@ -306,6 +306,38 @@ inline ValidRegion shape_to_valid_region_gaussian_pyramid_half(const TensorShape
     return valid_region;
 }
 
+/** Create a valid region for Laplacian Pyramid based on tensor shape and valid region at level "i - 1" and border mode
+ *
+ * @note The border size is 2 in case of Laplacian Pyramid
+ *
+ * @param[in] a_shape          Shape used at level "i - 1" of Laplacian Pyramid
+ * @param[in] a_valid_region   Valid region used at level "i - 1" of Laplacian Pyramid
+ * @param[in] border_undefined (Optional) Boolean indicating if the border mode is undefined.
+ *
+ *  return The valid region for the level "i" of Laplacian Pyramid
+ */
+inline ValidRegion shape_to_valid_region_laplacian_pyramid(const TensorShape &a_shape, const ValidRegion &a_valid_region, bool border_undefined = false)
+{
+    ValidRegion valid_region = shape_to_valid_region_gaussian_pyramid_half(a_shape, a_valid_region, border_undefined);
+
+    if(border_undefined)
+    {
+        const BorderSize gaussian5x5_border(2);
+
+        auto border_left   = static_cast<int>(gaussian5x5_border.left);
+        auto border_right  = static_cast<int>(gaussian5x5_border.right);
+        auto border_top    = static_cast<int>(gaussian5x5_border.top);
+        auto border_bottom = static_cast<int>(gaussian5x5_border.bottom);
+
+        valid_region.anchor.set(0, valid_region.anchor[0] + border_left);
+        valid_region.anchor.set(1, valid_region.anchor[1] + border_top);
+        valid_region.shape.set(0, std::max(0, static_cast<int>(valid_region.shape[0]) - border_right - border_left));
+        valid_region.shape.set(1, std::max(0, static_cast<int>(valid_region.shape[1]) - border_top - border_bottom));
+    }
+
+    return valid_region;
+}
+
 /** Write the value after casting the pointer according to @p data_type.
  *
  * @warning The type of the value must match the specified data type.
diff --git a/tests/validation/CL/LaplacianPyramid.cpp b/tests/validation/CL/LaplacianPyramid.cpp
new file mode 100644
index 0000000000..960dceef05
--- /dev/null
+++ b/tests/validation/CL/LaplacianPyramid.cpp
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "arm_compute/core/Types.h"
+#include "arm_compute/runtime/CL/CLPyramid.h"
+#include "arm_compute/runtime/CL/CLTensor.h"
+#include "arm_compute/runtime/CL/CLTensorAllocator.h"
+#include "arm_compute/runtime/CL/functions/CLLaplacianPyramid.h"
+#include "tests/CL/CLAccessor.h"
+#include "tests/datasets/BorderModeDataset.h"
+#include "tests/datasets/ShapeDatasets.h"
+#include "tests/framework/Asserts.h"
+#include "tests/framework/Macros.h"
+#include "tests/framework/datasets/Datasets.h"
+#include "tests/validation/Validation.h"
+#include "tests/validation/fixtures/LaplacianPyramidFixture.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace
+{
+const auto small_laplacian_pyramid_levels = framework::dataset::make("NumLevels", 2, 3);
+const auto large_laplacian_pyramid_levels = framework::dataset::make("NumLevels", 2, 5);
+
+const auto formats = combine(framework::dataset::make("FormatIn", Format::U8), framework::dataset::make("FormatOut", Format::S16));
+
+template <typename T>
+inline void validate_laplacian_pyramid(const CLPyramid &target, const std::vector<SimpleTensor<T>> &reference, BorderMode border_mode)
+{
+    CLTensor   *level_image  = target.get_pyramid_level(0);
+    ValidRegion valid_region = shape_to_valid_region(reference[0].shape(), border_mode == BorderMode::UNDEFINED, BorderSize(2));
+
+    // Validate lowest level
+    validate(CLAccessor(*level_image), reference[0], valid_region);
+
+    // Validate remaining levels
+    for(size_t lev = 1; lev < target.info()->num_levels(); lev++)
+    {
+        level_image                = target.get_pyramid_level(lev);
+        CLTensor *prev_level_image = target.get_pyramid_level(lev - 1);
+
+        valid_region = shape_to_valid_region_laplacian_pyramid(prev_level_image->info()->tensor_shape(),
+                                                               prev_level_image->info()->valid_region(),
+                                                               border_mode == BorderMode::UNDEFINED);
+
+        // Validate level
+        validate(CLAccessor(*level_image), reference[lev], valid_region);
+    }
+}
+} // namespace
+
+TEST_SUITE(CL)
+TEST_SUITE(LaplacianPyramid)
+
+// *INDENT-OFF*
+// clang-format off
+DATA_TEST_CASE(Configuration, framework::DatasetMode::ALL, combine(combine(
+                                                           concat(datasets::Medium2DShapes(), datasets::Large2DShapes()),
+                                                           datasets::BorderModes()),
+                                                           large_laplacian_pyramid_levels),
+                                                           shape, border_mode, num_levels)
+{
+    // Create pyramid info
+    PyramidInfo pyramid_info(num_levels, SCALE_PYRAMID_HALF, shape, Format::S16);
+    CLPyramid   dst_pyramid{};
+    dst_pyramid.init(pyramid_info);
+
+    // Create Tensors
+    CLTensor src = create_tensor<CLTensor>(shape, Format::U8);
+
+    // The first two dimensions of the output tensor must match the first two
+    // dimensions of the tensor in the last level of the pyramid
+    TensorShape dst_shape(shape);
+    dst_shape.set(0, dst_pyramid.get_pyramid_level(num_levels - 1)->info()->dimension(0));
+    dst_shape.set(1, dst_pyramid.get_pyramid_level(num_levels - 1)->info()->dimension(1));
+    CLTensor dst = create_tensor<CLTensor>(dst_shape, Format::S16);
+
+    // Create and configure function
+    CLLaplacianPyramid laplacian_pyramid;
+    laplacian_pyramid.configure(&src, &dst_pyramid, &dst, border_mode, 0);
+
+    ARM_COMPUTE_EXPECT(src.info()->is_resizable(), framework::LogLevel::ERRORS);
+    ARM_COMPUTE_EXPECT(dst.info()->is_resizable(), framework::LogLevel::ERRORS);
+
+    for(size_t level = 0; level < pyramid_info.num_levels(); ++level)
+    {
+        ARM_COMPUTE_EXPECT(dst_pyramid.get_pyramid_level(level)->info()->is_resizable(), framework::LogLevel::ERRORS);
+    }
+}
+
+using CLLaplacianPyramidFixture = LaplacianPyramidValidationFixture<CLTensor, CLAccessor, CLLaplacianPyramid, uint8_t, int16_t, CLPyramid>;
+
+FIXTURE_DATA_TEST_CASE(RunSmall, CLLaplacianPyramidFixture, framework::DatasetMode::PRECOMMIT,
+                       combine(combine(combine(
+                       datasets::Medium2DShapes(),
+                       datasets::BorderModes()),
+                       small_laplacian_pyramid_levels),
+                       formats))
+{
+    validate_laplacian_pyramid(_target, _reference, _border_mode);
+}
+
+FIXTURE_DATA_TEST_CASE(RunLarge, CLLaplacianPyramidFixture, framework::DatasetMode::NIGHTLY,
+                       combine(combine(combine(
+                       datasets::Large2DShapes(),
+                       datasets::BorderModes()),
+                       large_laplacian_pyramid_levels),
+                       formats))
+{
+    validate_laplacian_pyramid(_target, _reference, _border_mode);
+}
+// clang-format on
+// *INDENT-ON*
+
+TEST_SUITE_END()
+TEST_SUITE_END()
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
diff --git a/tests/validation/NEON/LaplacianPyramid.cpp b/tests/validation/NEON/LaplacianPyramid.cpp
new file mode 100644
index 0000000000..456ae75494
--- /dev/null
+++ b/tests/validation/NEON/LaplacianPyramid.cpp
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "arm_compute/core/Types.h"
+#include "arm_compute/runtime/NEON/functions/NELaplacianPyramid.h"
+#include "arm_compute/runtime/Tensor.h"
+#include "arm_compute/runtime/TensorAllocator.h"
+#include "tests/NEON/Accessor.h"
+#include "tests/datasets/BorderModeDataset.h"
+#include "tests/datasets/ShapeDatasets.h"
+#include "tests/framework/Asserts.h"
+#include "tests/framework/Macros.h"
+#include "tests/framework/datasets/Datasets.h"
+#include "tests/validation/Validation.h"
+#include "tests/validation/fixtures/LaplacianPyramidFixture.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace
+{
+const auto small_laplacian_pyramid_levels = framework::dataset::make("NumLevels", 2, 3);
+const auto large_laplacian_pyramid_levels = framework::dataset::make("NumLevels", 2, 5);
+
+const auto formats = combine(framework::dataset::make("FormatIn", Format::U8), framework::dataset::make("FormatOut", Format::S16));
+
+template <typename T>
+inline void validate_laplacian_pyramid(const Pyramid &target, const std::vector<SimpleTensor<T>> &reference, BorderMode border_mode)
+{
+    Tensor     *level_image  = target.get_pyramid_level(0);
+    ValidRegion valid_region = shape_to_valid_region(reference[0].shape(), border_mode == BorderMode::UNDEFINED, BorderSize(2));
+
+    // Validate lowest level
+    validate(Accessor(*level_image), reference[0], valid_region);
+
+    // Validate remaining levels
+    for(size_t lev = 1; lev < target.info()->num_levels(); lev++)
+    {
+        level_image              = target.get_pyramid_level(lev);
+        Tensor *prev_level_image = target.get_pyramid_level(lev - 1);
+
+        valid_region = shape_to_valid_region_laplacian_pyramid(prev_level_image->info()->tensor_shape(),
+                                                               prev_level_image->info()->valid_region(),
+                                                               border_mode == BorderMode::UNDEFINED);
+
+        // Validate level
+        validate(Accessor(*level_image), reference[lev], valid_region);
+    }
+}
+} // namespace
+
+TEST_SUITE(NEON)
+TEST_SUITE(LaplacianPyramid)
+
+// *INDENT-OFF*
+// clang-format off
+DATA_TEST_CASE(Configuration, framework::DatasetMode::ALL, combine(combine(
+                                                           concat(datasets::Medium2DShapes(), datasets::Large2DShapes()),
+                                                           datasets::BorderModes()),
+                                                           large_laplacian_pyramid_levels),
+                                                           shape, border_mode, num_levels)
+{
+    // Create pyramid info
+    PyramidInfo pyramid_info(num_levels, SCALE_PYRAMID_HALF, shape, Format::S16);
+    Pyramid     dst_pyramid{};
+    dst_pyramid.init(pyramid_info);
+
+    // Create Tensors
+    Tensor src = create_tensor<Tensor>(shape, Format::U8);
+
+    // The first two dimensions of the output tensor must match the first two
+    // dimensions of the tensor in the last level of the pyramid
+    TensorShape dst_shape(shape);
+    dst_shape.set(0, dst_pyramid.get_pyramid_level(num_levels - 1)->info()->dimension(0));
+    dst_shape.set(1, dst_pyramid.get_pyramid_level(num_levels - 1)->info()->dimension(1));
+    Tensor dst = create_tensor<Tensor>(dst_shape, Format::S16);
+
+    // Create and configure function
+    NELaplacianPyramid laplacian_pyramid;
+    laplacian_pyramid.configure(&src, &dst_pyramid, &dst, border_mode, 0);
+
+    ARM_COMPUTE_EXPECT(src.info()->is_resizable(), framework::LogLevel::ERRORS);
+    ARM_COMPUTE_EXPECT(dst.info()->is_resizable(), framework::LogLevel::ERRORS);
+
+    for(size_t level = 0; level < pyramid_info.num_levels(); ++level)
+    {
+        ARM_COMPUTE_EXPECT(dst_pyramid.get_pyramid_level(level)->info()->is_resizable(), framework::LogLevel::ERRORS);
+    }
+}
+
+using NELaplacianPyramidFixture = LaplacianPyramidValidationFixture<Tensor, Accessor, NELaplacianPyramid, uint8_t, int16_t, Pyramid>;
+
+FIXTURE_DATA_TEST_CASE(RunSmall, NELaplacianPyramidFixture, framework::DatasetMode::PRECOMMIT,
+                       combine(combine(combine(
+                       datasets::Medium2DShapes(),
+                       datasets::BorderModes()),
+                       small_laplacian_pyramid_levels),
+                       formats))
+{
+    validate_laplacian_pyramid(_target, _reference, _border_mode);
+}
+
+FIXTURE_DATA_TEST_CASE(RunLarge, NELaplacianPyramidFixture, framework::DatasetMode::NIGHTLY,
+                       combine(combine(combine(
+                       datasets::Large2DShapes(),
+                       datasets::BorderModes()),
+                       large_laplacian_pyramid_levels),
+                       formats))
+{
+    validate_laplacian_pyramid(_target, _reference, _border_mode);
+}
+// clang-format on
+// *INDENT-ON*
+
+TEST_SUITE_END()
+TEST_SUITE_END()
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
diff --git a/tests/validation/fixtures/LaplacianPyramidFixture.h b/tests/validation/fixtures/LaplacianPyramidFixture.h
new file mode 100644
index 0000000000..6344272640
--- /dev/null
+++ b/tests/validation/fixtures/LaplacianPyramidFixture.h
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef ARM_COMPUTE_TEST_LAPLACIAN_PYRAMID_FIXTURE
+#define ARM_COMPUTE_TEST_LAPLACIAN_PYRAMID_FIXTURE
+
+#include "arm_compute/core/IPyramid.h"
+#include "arm_compute/core/PyramidInfo.h"
+#include "arm_compute/core/TensorShape.h"
+#include "arm_compute/core/Types.h"
+#include "tests/AssetsLibrary.h"
+#include "tests/Globals.h"
+#include "tests/IAccessor.h"
+#include "tests/framework/Asserts.h"
+#include "tests/framework/Fixture.h"
+#include "tests/validation/reference/LaplacianPyramid.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+template <typename TensorType, typename AccessorType, typename FunctionType, typename T, typename U, typename PyramidType>
+class LaplacianPyramidValidationFixture : public framework::Fixture
+{
+public:
+    template <typename...>
+    void setup(TensorShape input_shape, BorderMode border_mode, size_t num_levels, Format format_in, Format format_out)
+    {
+        std::mt19937                     generator(library->seed());
+        std::uniform_int_distribution<T> distribution_u8(0, 255);
+        const T                          constant_border_value = distribution_u8(generator);
+
+        _pyramid_levels = num_levels;
+        _border_mode    = border_mode;
+
+        _target    = compute_target(input_shape, border_mode, constant_border_value, format_in, format_out);
+        _reference = compute_reference(input_shape, border_mode, constant_border_value, format_in, format_out);
+    }
+
+protected:
+    template <typename V>
+    void fill(V &&tensor)
+    {
+        library->fill_tensor_uniform(tensor, 0);
+    }
+
+    PyramidType compute_target(const TensorShape &input_shape, BorderMode border_mode, T constant_border_value,
+                               Format format_in, Format format_out)
+    {
+        // Create pyramid
+        PyramidType pyramid{};
+
+        // Create Pyramid Info
+        PyramidInfo pyramid_info(_pyramid_levels, SCALE_PYRAMID_HALF, input_shape, format_out);
+
+        // Use conservative padding strategy to fit all subsequent kernels
+        pyramid.init_auto_padding(pyramid_info);
+
+        // Create tensors
+        TensorType src = create_tensor<TensorType>(input_shape, format_in);
+
+        // The first two dimensions of the output tensor must match the first
+        // two dimensions of the tensor in the last level of the pyramid
+        TensorShape dst_shape(input_shape);
+        dst_shape.set(0, pyramid.get_pyramid_level(_pyramid_levels - 1)->info()->dimension(0));
+        dst_shape.set(1, pyramid.get_pyramid_level(_pyramid_levels - 1)->info()->dimension(1));
+
+        // The lowest resolution tensor necessary to reconstruct the input
+        // tensor from the pyramid.
+        _dst_target = create_tensor<TensorType>(dst_shape, format_out);
+
+        // Create and configure function
+        FunctionType laplacian_pyramid;
+        laplacian_pyramid.configure(&src, &pyramid, &_dst_target, border_mode, constant_border_value);
+
+        ARM_COMPUTE_EXPECT(src.info()->is_resizable(), framework::LogLevel::ERRORS);
+        ARM_COMPUTE_EXPECT(_dst_target.info()->is_resizable(), framework::LogLevel::ERRORS);
+
+        // Allocate tensors
+        src.allocator()->allocate();
+        _dst_target.allocator()->allocate();
+
+        ARM_COMPUTE_EXPECT(!src.info()->is_resizable(), framework::LogLevel::ERRORS);
+        ARM_COMPUTE_EXPECT(!_dst_target.info()->is_resizable(), framework::LogLevel::ERRORS);
+
+        pyramid.allocate();
+
+        for(size_t i = 0; i < pyramid_info.num_levels(); ++i)
+        {
+            ARM_COMPUTE_EXPECT(!pyramid.get_pyramid_level(i)->info()->is_resizable(), framework::LogLevel::ERRORS);
+        }
+
+        // Fill tensors
+        fill(AccessorType(src));
+
+        // Compute function
+        laplacian_pyramid.run();
+
+        return pyramid;
+    }
+
+    std::vector<SimpleTensor<U>> compute_reference(const TensorShape &shape, BorderMode border_mode, T constant_border_value,
+                                                   Format format_in, Format format_out)
+    {
+        // Create reference
+        SimpleTensor<T> src{ shape, format_in };
+
+        // The first two dimensions of the output tensor must match the first
+        // two dimensions of the tensor in the last level of the pyramid
+        TensorShape dst_shape(shape);
+        dst_shape.set(0, static_cast<float>(shape[0] + 1) / static_cast<float>(std::pow(2, _pyramid_levels - 1)));
+        dst_shape.set(1, static_cast<float>(shape[1] + 1) / static_cast<float>(std::pow(2, _pyramid_levels - 1)));
+
+        _dst_reference = SimpleTensor<U>(dst_shape, format_out);
+
+        // Fill reference
+        fill(src);
+
+        return reference::laplacian_pyramid<T, U>(src, _dst_reference, _pyramid_levels, border_mode, constant_border_value);
+    }
+
+    size_t                       _pyramid_levels{};
+    BorderMode                   _border_mode{};
+    SimpleTensor<U>              _dst_reference{};
+    TensorType                   _dst_target{};
+    PyramidType                  _target{};
+    std::vector<SimpleTensor<U>> _reference{};
+};
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_TEST_LAPLACIAN_PYRAMID_FIXTURE */
diff --git a/tests/validation/reference/LaplacianPyramid.cpp b/tests/validation/reference/LaplacianPyramid.cpp
new file mode 100644
index 0000000000..566847453b
--- /dev/null
+++ b/tests/validation/reference/LaplacianPyramid.cpp
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "LaplacianPyramid.h"
+
+#include "tests/validation/reference/ArithmeticSubtraction.h"
+#include "tests/validation/reference/DepthConvertLayer.h"
+#include "tests/validation/reference/Gaussian5x5.h"
+#include "tests/validation/reference/GaussianPyramidHalf.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace reference
+{
+template <typename T, typename U>
+std::vector<SimpleTensor<U>> laplacian_pyramid(const SimpleTensor<T> &src, SimpleTensor<U> &dst, size_t num_levels, BorderMode border_mode, uint8_t constant_border_value)
+{
+    std::vector<SimpleTensor<T>> pyramid_conv;
+    std::vector<SimpleTensor<U>> pyramid_dst;
+
+    // First, a Gaussian pyramid with SCALE_PYRAMID_HALF is created
+    std::vector<SimpleTensor<T>> gaussian_level_pyramid = reference::gaussian_pyramid_half(src, border_mode, constant_border_value, num_levels);
+
+    // For each level i, the corresponding image Ii is blurred with Gaussian 5x5
+    // filter, and the difference between the two images is the corresponding
+    // level Li of the Laplacian pyramid
+    for(size_t i = 0; i < num_levels; ++i)
+    {
+        const SimpleTensor<T> level_filtered = reference::gaussian5x5(gaussian_level_pyramid[i], border_mode, constant_border_value);
+        pyramid_conv.push_back(level_filtered);
+
+        const SimpleTensor<U> level_sub = reference::arithmetic_subtraction<T, T, U>(gaussian_level_pyramid[i], level_filtered, dst.data_type(), ConvertPolicy::WRAP);
+        pyramid_dst.push_back(level_sub);
+    }
+
+    // Return the lowest resolution image and the pyramid
+    dst = depth_convert<T, U>(pyramid_conv[num_levels - 1], DataType::S16, ConvertPolicy::WRAP, 0);
+
+    return pyramid_dst;
+}
+
+template std::vector<SimpleTensor<int16_t>> laplacian_pyramid(const SimpleTensor<uint8_t> &src, SimpleTensor<int16_t> &dst, size_t num_levels, BorderMode border_mode, uint8_t constant_border_value);
+} // namespace reference
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
diff --git a/tests/validation/reference/LaplacianPyramid.h b/tests/validation/reference/LaplacianPyramid.h
new file mode 100644
index 0000000000..aa76f56968
--- /dev/null
+++ b/tests/validation/reference/LaplacianPyramid.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_TEST_LAPLACIAN_PYRAMID_H__
+#define __ARM_COMPUTE_TEST_LAPLACIAN_PYRAMID_H__
+
+#include "tests/SimpleTensor.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace reference
+{
+template <typename T, typename U>
+std::vector<SimpleTensor<U>> laplacian_pyramid(const SimpleTensor<T> &src, SimpleTensor<U> &dst, size_t num_levels, BorderMode border_mode, uint8_t constant_border_value);
+} // namespace reference
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_TEST_LAPLACIAN_PYRAMID_H__ */